Denali Ranger is an inspiring biography about a man who dedicated most of his life to North America’s highest peak, Denali, and the land surrounding it. In many ways, it is a love story. As a national park ranger on 20310-foot Denali for nearly 40 years, Roger Robinson became a major figure in the mountain’s history by pioneering a new environmental ethos in climbing management: removing waste from the slopes, or “cleaning” the mountain.